CN211633919U - Double-sided directional weighting quantification moisture state detection sensor - Google Patents
Double-sided directional weighting quantification moisture state detection sensor Download PDFInfo
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Abstract
The utility model provides a two-sided directional weighting quantization moisture state detection sensor, including a film formula electric capacity sensor, electric capacity sensor includes an response strip, the response strip is flexible zonal structure, and it includes response face and lower response face, can realize the quantization moisture state on upper and lower two sides respectively and detect to can weigh the output according to specific proportion with the moisture state on upper and lower two sides, can provide a specific aspect and the relevant comprehensive moisture state information of specific direction with specific detection object from this.
Description
Technical Field
The utility model relates to a sensor, especially a two-sided directional weighting quantification moisture state detection sensor who detects with disposable absorption articles for use moisture state and is relevant.
Background
The disposable absorbent articles include sanitary products such as paper diapers, pull-ups, training pants, sanitary napkins and urine pads, for convenience of description, the following description will use paper diapers as an example, and the related contents also apply to other disposable absorbent articles. The paper diaper usually comprises a surface layer, an absorption layer and a leakage-proof layer, and the water absorption performance of the paper diaper is mainly embodied on the absorption layer. When urine wet occurs, urine can enter the absorption layer through the surface layer, and the high polymer material in the absorption layer can absorb moisture in the urine and lock the moisture, so that the surface layer is restored to a dry and comfortable state.
However, the water absorbing and locking capacity of the absorbent layer of the diaper is limited, when the amount of urine is large, the water cannot be completely absorbed and locked, and if the diaper is squeezed, the water flows back from the absorbent layer of the diaper, which is called liquid reverse osmosis, the surface layer of the diaper becomes wet and seeps, which is uncomfortable for users and also easily causes skin diseases (such as diaper rash), and the diaper is replaced as soon as possible, and if the diaper is not replaced, the urine is easy to leak, and bed pads are polluted.
Therefore, scientific paper diaper urine wet detection needs to know whether the surface layer or the bottom layer of the paper diaper is wet by urine or not, and also needs to know whether the absorption layer of the paper diaper is saturated or not, whether reverse osmosis occurs or not and whether the paper diaper needs to be replaced or not. Specifically, is it known whether the diaper topsheet is wet from above or back-impregnated from the absorbent layer? Although the topsheet of the diaper is wet, it represents two different conditions, the former being considered as the onset of wetting, and the latter being considered as the absorbent layer being saturated, a condition which requires urgent replacement.
If a sensor can be arranged between the surface layer and the absorption layer of the paper diaper and the sensor can respectively detect the moisture states of the surface layer and the absorption layer, a great help is brought. To do this, a film sensor with a double-sided directional moisture detection function is needed, which can be disposed at a specific position/layer of the diaper to realize moisture detection in a specific direction. It would be most desirable if the sensor could further quantify the wetness state of the upper and lower surfaces at a specific location and output them in a superimposed manner with a specified weight (e.g., a weight that increases the saturated reverse osmosis state of the absorbent layer), so that the output value represents the integrated wetness or urgency of diaper replacement, which is of great reference value for scientific and rational diaper usage and replacement.
For example, chinese patent application publication No. CN107174408A discloses an electronic moisture-sensing absorbent article and a related method, which uses a flexible electrode printed on the outer surface of a leakage-proof layer of the absorbent article as a sensor to achieve quantitative moisture state detection of the absorbent article, but the moisture state is the existence state of liquid between the leakage-proof layer and the absorbent layer, not the surface layer moisture state and the absorbent layer saturation/reverse osmosis state, and even the moisture state detection function of double-sided orientation and weighting cannot be achieved.
Chinese patent application publication No. CN107854220A discloses an electronic moisture-sensitive absorbent article and a method for detecting moisture level thereof, which uses flexible electrodes printed on the inner and outer surfaces of a leakage-proof layer of the absorbent article as sensors to detect the moisture state of the absorbent article, and similarly, the moisture state only represents the existence state of liquid between the absorption layer and the leakage-proof layer of the absorbent article, but not the moisture state of the surface layer of the absorbent article and the saturation/reverse osmosis state of the absorption layer, and the dual-sided orientation and weighted moisture state detection function cannot be realized.
Chinese patent application publication No. CN102650608A discloses a liquid detection device and method based on an electrochemical capacitor, and a diaper, which uses a conductive ink induction line directly contacting with urine in the diaper as a sensor, and realizes a quantitative urine wetness detection function by means of the electrochemical capacitor. Although these lines can be placed on different layers of the diaper, they cannot distinguish the liquid from different directions, and they cannot perform directional urine detection and weighting treatment, and the electrochemical capacitance generated by them is large, so the reaction speed of the system is very slow, and it is difficult to meet the requirement of real-time status monitoring.
Chinese patent application publication No. CN106691699A discloses a sensor for detecting urine wetness by setting conductive tape on a hydrophilic substrate, which can be set on the surface layer of a paper diaper and also can be set between the surface layer and an absorbing layer, but the sensor can not distinguish urine from different directions, because urine in any direction can be infiltrated with the hydrophilic substrate to generate a urine wetness alarm signal, and meanwhile, the sensor adopts a resistance mode of urine wetness short circuit to detect the presence of urine, which can only detect whether urine wetness occurs and can not detect the degree of urine wetness in principle, i.e. quantitative urine wetness detection function can not be realized, and more, double-sided directional and weighted wetness state detection function can not be realized.
U.S. patent publication No. US2013/0018340a1 discloses a wetness detecting system for an absorbent article that has an array of sensors disposed on the outer surface of the absorbent article to detect changes in capacitance of the absorbent article to determine the degree of wetness. Since the sensor is non-invasive, the detected value is a comprehensive value seen from the outside, and the urine wetting conditions on different layers cannot be distinguished. In addition, the dielectric constant detection device is an open dielectric capacitor, and the dielectric constant detection device detects the dielectric constant change of peripheral substances, so that whether the urine reverse osmosis condition occurs in the absorbing article or not is unknown. In addition, the capacitance of the open type dielectric capacitor is usually very small, and the open type dielectric capacitor is easily interfered by the capacitance of a human body and peripheral substances, and the moisture state detection function of double-sided orientation and weighting cannot be realized.
The above prior art solutions have various disadvantages, and new solutions are needed to solve the problems.
Disclosure of Invention
The utility model aims to solve the technical problem that a can realize quick detection's two-sided directional weighting quantization moisture state detection sensor is provided, it includes the capacitive sensor/response strip of a film formula, it has upper and lower two response faces, is fit for setting up and uses on panty-shape diapers's different aspect, can realize that the moisture state of upper and lower two sides detects and can carry out quantization processing and adjust the state weight of upper and lower two sides and make the output of weighing to satisfy user's different application demands. When the sensor is arranged between the surface layer and the absorption layer of the paper diaper, the moisture state detection of the surface layer and the reverse osmosis state detection of the absorption layer can be realized, the output weight of the reverse osmosis state of the absorption layer can be increased, and the signal for replacing the paper diaper can be more quickly presented in the reverse osmosis state of the absorption layer.
In order to solve the technical problem, the utility model provides a two-sided directional weighting quantization moisture state detection sensor, including a film-type capacitance sensor, capacitance sensor includes an response strip, the response strip is flexible zonal structure, and it includes response face and lower response face, can realize quantization moisture state detection on upper and lower two sides respectively to can be with the moisture state of upper and lower two sides according to specific proportion weighting output, provide one from this with the specific aspect of specific detection object and the relevant comprehensive moisture state information of specific direction.
The sensor comprises an upper waterproof film corresponding to the upper sensing surface and a lower waterproof film corresponding to the lower sensing surface, wherein a sealed sensing layer is arranged between the upper waterproof film and the lower waterproof film, and the sensing layer is formed by covering and insulating the upper waterproof film and the lower waterproof film.
The sensing strip comprises a first detection electrode and a second detection electrode, the first detection electrode and the second detection electrode are arranged in the sensing layer, are completely covered by the upper waterproof film and the lower waterproof film, and are not in contact with the liquid to be detected in work; or
The first detection electrode and the second detection electrode are arranged in the induction layer, wherein the first detection electrode is completely covered by the upper waterproof film and the lower waterproof film and is not contacted with the liquid to be detected in work, at least one part of the second detection electrode is exposed outwards through the interlayer edges of the upper waterproof film and the lower waterproof film or any other gaps or gaps arranged on the waterproof films, and is contacted with the liquid to be detected containing electrolyte through the exposed part in work to enable the liquid to be equipotential with the liquid to be detected and form a liquid electrode.
The sensing strip comprises a first detection electrode and a second detection electrode, the first detection electrode is arranged in the sensing layer and protected, and is not in contact with the liquid to be detected in work, the second detection electrode is positioned on the outer surface of either side of the upper waterproof film and the lower waterproof film, and is directly in contact with the liquid to be detected containing electrolyte in work, so that the liquid is equipotential with the liquid and forms a liquid electrode; and
the orthographic projection of the first and second detection electrodes comprises an overlapping part, and the electrodes of the overlapping part form a capacitor with an initial capacitance value of C0The dielectric capacitance of (1); and
when the liquid electrode is covered on the outer surface of the waterproof film corresponding to the first detection electrode, an electrolytic capacitor is generated between the liquid electrode and the first detection electrode, and the first detection electrode and the second detection electrode form the medium capacitor C0Adding the electrolytic capacitor to C and outputting, wherein the wet state can be represented by formula (C-C)0)/C0The larger the numerical value, the more serious the comprehensive moisture degree of a specific layer of the specific detection object; and
the induction strip has the length self-adaption capability, and the comprehensive moisture state ((C-C) of a specific layer of the specific detection object0)/C0) Regardless of the length of the sensor strip.
When the liquid to be detected containing electrolyte is accumulated on the upper sensing surface and the lower sensing surface, the first detection electrode, the second detection electrode, the upper waterproof film, the lower waterproof film and the liquid to be detected jointly form a non-polar electrolytic capacitor, wherein the first detection electrode and the second detection electrode form the electrodes of the electrolytic capacitor, the liquid to be detected forms the electrolyte of the electrolytic capacitor, the waterproof film forms the dielectric medium of the electrolytic capacitor, the capacitance of the electrolytic capacitor is in direct proportion to the area of the liquid to be detected on the sensing surface corresponding to the first detection electrode, the detection sensitivity of the upper sensing surface and the lower sensing surface is in direct proportion to the dielectric constants of the upper waterproof film and the lower waterproof film and in inverse proportion to the thicknesses of the upper waterproof film and the lower waterproof film, and the weights of the wet states of the upper sensing surface and the lower sensing surface are in inverse proportion to the weights of the upper waterproof film and the lower waterproof film, The detection sensitivity of the lower sensing surface is proportional.
The disposable excrement absorption device comprises an excrement bearing and absorption device, a surface layer, an absorption layer and a leakage-proof layer, wherein the excrement bearing and absorption device is provided with the appearance design of the disposable absorption article and comprises the surface layer, the absorption layer and the leakage-proof layer, and the induction strip is arranged on the surface layer, or between the surface layer and the absorption layer, or between the absorption layer and the leakage-proof layer.
The device comprises a detection device, wherein the detection device comprises a capacitance detection device which is electrically connected with a first detection electrode and a second detection electrode of the induction strip when in use and realizes the comprehensive moisture state detection function of the excrement bearing and absorbing device on a specific layer and in a specific direction in a capacitance detection mode.
The capacitance detection device comprises a contact electrode, the contact electrode comprises a metal needle point, and the metal needle point can penetrate through the waterproof film of the induction strip and is electrically connected with the detection electrode when in use.
The device comprises a wireless transmitting unit and a wireless receiving and displaying device, and can transmit and receive the moisture state information of the absorbing articles and perform related state display or state alarm prompt.
Wherein, the width of the induction strip comprises 5 to 50 millimeters, the thickness of the induction strip comprises 0.01 to 1 millimeter, the thickness of the waterproof film comprises 5 to 500 micrometers, the detection electrode comprises a conductive ink printing line or a metal foil line, the upper waterproof film or the lower waterproof film comprises a plastic film, the plastic film comprises a high tensile strength film, the high tensile strength film comprises a BOPP film or a PET film, the thickness of the lower waterproof film is less than that of the upper waterproof film, the excrement bearing and absorbing device comprises a paper diaper, a pull-up diaper, a training pant, a sanitary towel or a urine pad, the liquid to be detected containing electrolyte comprises urine, the wireless receiving and displaying device comprises a mobile phone or a computer, the induction strip comprises more than two groups of detection electrodes, each group of detection electrodes comprises at least one first detection electrode and one second detection electrode, each set of detection electrodes is capable of directionally detecting a wetness state on a particular sensing surface, and the first detection electrode or the second detection electrode of one set is multiplexed with the first detection electrode or the second detection electrode of the other set.
The beneficial effects of the utility model reside in that, a disposable film sensor with two response faces is provided, this sensor is fit for setting up and uses on panty-shape diapers's specific aspect, can detect the quantization humid state of two upper and lower response faces respectively to can set up different detectivity for upper and lower response face and be used for the signal stack output of different weights, in order to satisfy the different requirements that the user used to panty-shape diapers, provide an objective and scientific foundation for panty-shape diapers's rational use and in good time change.
Meanwhile, the sensing strips are arranged in the paper diaper in a coiled manner before being arranged in the paper diaper, the detection electrodes are arranged in parallel, and the cross sections of the detection electrodes at any position in the length direction are equal, so that the sensing strips can be suitable for manufacturing the paper diapers with different specifications and lengths.
Simultaneously the utility model discloses an electrolytic capacitor urine wet detection mode, it both had higher detectivity and reliability, had very fast reaction rate again simultaneously, and its detection loop time constant is millisecond level usually, can do real-time state monitoring, is that an intelligent panty-shape diapers urine wet detection technical solution fast, that the precision is high, with low costs and can standardize.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a moisture status detection sensor according to an embodiment of the present invention.
Fig. 2 is a schematic view of a layered structure of a sensor for detecting a moisture state with double-sided directional weighting according to an embodiment of the present invention, which includes an inductive strip and a disposable excreta bearing and absorbing device.
Fig. 3 is a schematic diagram of a layered structure of a sensor strip of a sensor for detecting a wet state according to an embodiment of the present invention.
Fig. 4 is a side sectional view (longitudinal section) of a sensor strip of a double-sided directional weighting moisture status detection sensor according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a cross-sectional structure a-a' of a sensor strip of a sensor for detecting a moisture state according to an embodiment of the present invention.
Fig. 6 is a graph of capacitance versus liquid coverage/length of a sensor strip of a dual-sided directional weighted moisture detection sensor according to an embodiment of the present invention.
Fig. 7 is a schematic cross-sectional structure diagram and an equivalent circuit diagram of a sensor strip of a double-sided directional weighting moisture status detection sensor according to an embodiment of the present invention.
Fig. 8 is a schematic cross-sectional structure diagram and an equivalent circuit diagram of a sensor strip of a double-sided directional weighting moisture status detection sensor according to an embodiment of the present invention.
Fig. 9 is a schematic cross-sectional structure diagram and an equivalent circuit diagram of a sensor strip of a double-sided directional weighting moisture status detection sensor according to an embodiment of the present invention.
Fig. 10 is a schematic cross-sectional view and an equivalent circuit diagram of a sensor strip of a double-sided directional weighting moisture status detection sensor according to an embodiment of the present invention.
Fig. 11 is a schematic cross-sectional structure diagram and an equivalent circuit diagram of a sensor strip of a double-sided directional weighting moisture status detection sensor according to an embodiment of the present invention.
Fig. 12 is a schematic cross-sectional view and an equivalent circuit diagram of a sensor strip of a double-sided directional weighting moisture status detection sensor according to an embodiment of the present invention.
Fig. 13 is a schematic cross-sectional view and an equivalent circuit diagram of a sensor strip of a double-sided directional weighting moisture status detection sensor according to an embodiment of the present invention.
Fig. 14 is a schematic cross-sectional view and an equivalent circuit diagram of a sensor strip of a double-sided directional weighting moisture status detection sensor according to an embodiment of the present invention.
Fig. 15 is a schematic cross-sectional structure view and an equivalent circuit diagram of a double-sided directional weighting and quantification moisture state detection sensor according to an embodiment of the present invention, wherein the sensor strip includes a plurality of groups of detection electrodes.
Fig. 16 is a schematic cross-sectional structure diagram and an equivalent circuit diagram of a double-sided directional weighting sensor for quantifying a moisture state according to an embodiment of the present invention, wherein the sensor strip includes a plurality of sets of detection electrodes.
Fig. 17 is a schematic cross-sectional structure diagram and an equivalent circuit diagram of a double-sided directional weighting moisture status detection sensor according to an embodiment of the present invention, wherein the sensor strip includes multiple groups of detection electrodes and has an electrode multiplexing condition.
Fig. 18 is a schematic cross-sectional structure diagram and an equivalent circuit diagram of a double-sided directional weighting sensor for quantifying a moisture state according to an embodiment of the present invention, wherein the sensor strip includes multiple sets of detection electrodes and the electrodes are multiplexed.
Fig. 19 is a schematic diagram of an embodiment of the present invention, in which an inductive strip of a double-sided directional weighting quantization moisture status detection sensor is electrically connected to a capacitance detection device through a needle tip.
Fig. 20 is a block diagram of a double-sided directional weighting moisture status detection sensor according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments in which the invention may be practiced. The terms of direction and position in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., refer to the direction and position of the attached drawings. Accordingly, the use of directional and positional terms is intended to illustrate and understand the present invention and is not intended to limit the scope of the invention.
The present invention will be further described with reference to the accompanying drawings. Fig. 1 is a schematic structural diagram of a moisture status detecting sensor according to an embodiment of the present invention. In the figure 10 disposable absorbent articles (including diapers, training pants, toddlery pants, disposable diapers, diaper pads, sanitary napkins, etc.) are shown, which generally comprise a top layer (inner layer, dry layer, which is attached to the skin of the user during use), a leakage-proof layer (bottom layer, bottom film, which is facing away from the skin of the user during use), an absorbent layer (moisture-absorbing layer, interlayer, which is located between the top layer and the leakage-proof layer).
In the figure, 20 is a disposable film type capacitance sensor (which may be referred to as a film sensor, a capacitance sensor for short) disposed on a specific layer of the disposable absorbent article 10 (e.g., between the surface layer, the surface layer and the absorbent layer, the absorbent layer and the bottom layer, etc.), and the film sensor includes a strip-shaped flexible sensor strip, in the embodiment of the present invention, the film sensor generally appears in the form of a sensor strip, so the sensor strip can also be used to represent the film sensor, and in the embodiment of the present invention, 20 can represent both the film sensor and the sensor strip. The sensing strip includes first measuring electrode 21 and second measuring electrode 22, and the combination of measuring electrode 21, 22 can be used for 23 marks, and it is usually formed by printing with conductive ink (for example carbon oar) on waterproof film (for example BOPP biaxially oriented polypropylene film, PET polyester film or other plastic film) through modes such as intaglio, flexography, is a conductive ink line, consequently the utility model discloses the measuring electrode of embodiment also can be called conductive ink line. In addition, the detection electrode may be formed on the waterproof film by vacuum metal evaporation (e.g., aluminum plating) or other processes, and may be a metal film/metal foil (e.g., aluminum film/aluminum foil) electrode.
Because the detection electrode of conductive ink printing or metal coating by vaporization is generally all very thin, and it depends on flexible water proof membrane, makes whole response strip all have the flexibility, consequently the utility model discloses the detection electrode also can be called flexible electrode. The detection electrode in the figure is composed of two parallel electrodes, and in practical application, the detection electrode can have various designs, and can also comprise a plurality of electrodes or a plurality of groups of electrodes (each group of electrodes can comprise one or more electrodes). Also included is an external (with respect to the absorbent article 10) sensing device 30 comprising a capacitive sensing device used in combination with the sensing electrode 23 via electrical connection 24 to capacitively sense (digitize) the wetness state of the disposable absorbent article 10. In practical applications, the length of the sensor strip may be the same as or shorter than the length of the absorbent article, and in order to facilitate the electrical connection with the capacitive sensing device 30, one end of the sensor strip 20 is usually flush (or nearly flush) with the edge of one end of the absorbent article (e.g., at the front abdomen/waistband position), so that the capacitive sensing device can be conveniently clipped onto the absorbent article and electrically connected to the sensor strip.
The sensing strip is the most basic unit of the two-sided directional weighting quantification moisture state detection sensor, the disposable absorption article can be regarded as a supporting excrement bearing and absorbing device, and the integration of the sensing strip and the absorption article ensures that the sensing strip has a specific detection object, which is one of the concrete expression forms of the embodiment of the utility model. Similarly, the sensor of the present invention can be made to have a digital output representation by adding a detection device to digitize the state information of the sensor strip. The utility model discloses still can integrate the response strip with more functional device (for example wireless device), make it possess more functional characteristics to constitute corresponding state detection sensor, these all belong to the scope that the utility model discloses cover.
Referring to fig. 2 again, it is a schematic diagram of a layered structure of a double-sided directional weighted moisture status detection sensor including a sensor strip and a disposable excreta carrier and absorbent device according to an embodiment of the present invention. The following description will be given by taking a diaper as an example, and the description is also applicable to other disposable absorbent articles such as diapers, toddlery pants, pull-up pants, diaper, sanitary napkins and the like. The diaper in the figure comprises a surface layer 11, an absorption layer 12 and a leakage-proof layer 15. When the absorbent article is used, the surface layer 11 directly contacts the skin of a human body (for example, covers the crotch of the human body), when the human body urinates, urine can enter the absorbent layer 12 through the hydrophilic and porous breathable surface layer 11, and is absorbed by wood pulp and polymer absorbent materials (SAP) in the absorbent layer to lock water in the absorbent layer, so that the surface layer 11 is restored to a dry state. As for the leakage-preventing layer 15, mainly for preventing urine leakage, it is generally formed of a polyethylene film (PE) which is permeable or non-permeable.
The figure includes a sensor strip 20, and a detection electrode 23, which is composed of a first detection electrode and a second detection electrode, is included on the sensor strip 20. In order to realize the moisture state detection of the diaper surface layer and the reverse osmosis state detection of the absorption layer, the sensing strip 20 is preferably arranged between the diaper surface layer 11 and the absorption layer 12 in the embodiment. The sensing strip has an upper surface and a lower surface, and has the humidity detection/humidity sensing capacity in the corresponding directions of the upper surface and the lower surface, the upper surface and the lower surface of the sensing strip are respectively called as an upper sensing surface and a lower sensing surface, the sensing strip in the figure can detect urine (passing through the upper sensing surface) from a human body on the upper paper diaper surface layer and can also detect liquid (passing through the lower sensing surface) reversely seeped from the paper diaper absorption layer on the lower surface, and therefore, the humidity detection with double-sided orientation (in the upper direction and the lower direction) is realized. For convenience of expression, the components (including the surface layer 11, the absorption layer 12, the leakage-proof layer 15, and the sensing strip 20) of the diaper of this embodiment are drawn in a layered manner, and in practical application, the components are bonded together by structural adhesive/hot melt adhesive, etc. The surface layer and the leakage-proof layer of the paper diaper are usually longer than the absorption layer, and the absorption layer can be wrapped in the absorption layer to prevent liquid in the absorption layer from leaking.
In practical applications, the sensor strip 20 may also be disposed on different layers of the absorbent article 10 to achieve moisture detection on a specific layer and a specific direction, for example, the sensor strip 20 may be attached to the surface layer 11 of the diaper, the upper sensor surface faces the skin of the user to achieve moisture detection on the skin of the human body, and the lower sensor surface contacts the surface layer of the diaper to achieve moisture detection on the surface layer; for another example, the sensor strip 20 may be disposed between the absorbent article leakage layer 15 and the absorbent layer 12 with the upper sensing surface facing the absorbent layer such that the upper sensing surface can detect wetness in the absorbent article absorbent layer 12.
Referring to fig. 3 again, it is a schematic diagram of a layered structure of a sensor strip of a double-sided directional weighting moisture status detection sensor according to an embodiment of the present invention. In the figure, 20 is a sensor strip comprising a lower waterproof membrane 25, an upper waterproof membrane 26, and a detection electrode 23 printed/arranged on the inner surface of the lower waterproof membrane. For convenience of expression, the components of the induction bars in the drawing are drawn in a layered manner. In practical application, the components are bonded together by structural adhesive/hot melt adhesive or pressed together by hot pressing. The upper and lower waterproof films can seal the main body part (circuit) of the detection electrode, and prevent liquid (including urine) containing electrolyte in the absorption layer from contacting the electrode to influence the normal work of the sensor.
In practical applications, the width of the sensor strip is moderate. If too wide, it will not only increase the cost, but also affect the air and water permeability of the diaper topsheet, since the sensor strip itself is impermeable to air and water. Simultaneously the response strip also can not be too narrow, if too narrow, the measuring electrode setting will have the difficulty to also be difficult to implement the electricity with the measuring electrode and be connected, and can reduce the tensile strength of response strip, the condition that the response strip was pulled apart appears easily in making the production process. Before the paper diaper is formed, the induction strip is usually in the form of a coiled material, the length of each coil of the induction strip is different from hundreds of meters to thousands of meters, and the induction strip can be used for producing hundreds of to thousands of different paper diaper products. When the paper diaper is produced, the sensing strip coil can be unreeled, straightened, bonded and cut off together with other materials/coils (such as a surface layer material and a bottom film material) of the paper diaper on a production line, if the tensile strength is not enough, the sensing strip coil can be broken in the unreeling or bonding process, so that a waterproof film with the width of 5-50 mm, preferably a high tensile strength plastic film with the width of 10-30 mm can be selected in practical application, and all indexes can meet the requirements more easily and have better cost benefit.
In the figure, it can be seen that the detection electrode patterns of the sensor strip 20 are the same from top to bottom (i.e. they are arranged in parallel), which means that the roll of sensor strip is suitable for making paper diapers of any specification and length, and when it is produced, it is only necessary to cut the paper diapers according to the length, and the cutting of the sensor strip at any position will not affect the performance and destroy the integrity of the detection electrode (i.e. its cross section is the same). This is an important property of diaper manufacturing material, and webs with this property can be used without the need for cut-to-size cutting, as long as they are cut transversely as required. Certainly, it is also feasible to add a blank area without the detection electrode pattern at the head and tail positions of the sensor strip, and because there is no detection electrode in the blank area, it can effectively avoid the liquid from short-circuiting the detection electrode at the cut-off position of the sensor strip to affect the normal operation of the sensor strip.
As for the thickness of the sensor strip, from 0.01 mm to 1 mm is useful, as long as it is not too thick, it does not affect the comfort of the absorbent article. For waterproof films, the thickness of films of different materials usually varies, and theoretically films with thickness of 5 to 500 micrometers are all usable, and preferably a biaxially oriented polypropylene film (BOPP) and a polyester film (PET) with thickness of 10 to 50 micrometers are used, because the strength of the two films is relatively high (belonging to a high tensile strength film, or called a rigid plastic film), and the two films can be relatively thin (for example, 12 micrometers) on the premise of meeting the requirement of tensile strength, and the two films can present good flexibility under the condition of the thickness.
The upper waterproof film and the lower waterproof film can be made of the same material, or different materials can be selected, for example, one of the materials can be a high tensile resistant film (such as BOPP or PET), and the other material can be a soft comfortable film (such as polyethylene PE or EVA), so that the waterproof fabric has good performance in strength and comfort. Alternatively, a waterproof coating may be formed by directly coating a waterproof paint on the detection electrode instead of one of the waterproof films, in which case the waterproof coating may be considered as one of the waterproof films.
Referring to fig. 4, a cross-sectional side view (longitudinal cross-section) of a sensor strip of a double-sided directional weighting moisture status detection sensor according to an embodiment of the present invention is shown. In the figure, 20 is a sensor/sensor strip comprising an upper waterproof membrane 26, a lower waterproof membrane 25, and a sensing layer 17 between the upper and lower waterproof membranes, the sensing layer 17 comprising a detection electrode 23. When a liquid 16 containing an electrolyte (referred to as a liquid to be detected) accumulates on the outer surface of upper water repellent film 26, a detectable electrolytic capacitance is created between the detection electrodes in sensing layer 17. Similarly, when a liquid containing an electrolyte, such as urine 18, seeps back up from the absorbent layer, accumulates on the outer surface of lower waterproof membrane 25, another detectable electrolytic capacitance is created between the detection electrodes in sensing layer 17. If the thicknesses (or dielectric constants) of the upper waterproof film and the lower waterproof film are different, capacitance values generated by the liquid to be detected in the same coverage range are different, and the capacitance values are specifically represented as different detection sensitivities of the upper sensing surface and the lower sensing surface. The thinner the waterproof film (or the larger the dielectric constant) the larger the capacitance value produced, i.e., the higher the detection sensitivity. Where L is the total effective length/detection area of the sensor strip 20, L is the actual coverage/length of the liquids 16 and 18 on the sensor strip, and the ratio of L to L is referred to herein as the liquid saturation or wetness of the sensor.
For convenience of description, the side of the waterproof films 25 and 26 in contact with the sensing layer 17 is referred to as an inner surface, the side of the waterproof films 25 and 26 not in contact with the sensing layer 17 is referred to as an outer surface, the side of the outer surface of the upper waterproof film 26 is referred to as an upper sensing surface, and the upper sensing surface faces a user in use and can detect liquid (e.g., urine) from a human body. And this side of the outer surface of the lower waterproof membrane 25 is referred to as the lower sensing surface, which faces away from the user when in use, and which can detect reverse osmosis liquid from below to above. In practical application, the sensing strips can be arranged on different layers of the paper diaper according to requirements, and the thicknesses of the upper waterproof film and the lower waterproof film can be selected according to requirements. For example, when the sensing strip is arranged between the surface layer and the absorption layer of the paper diaper, the thickness of the upper waterproof film can be selected to be a little thicker than that of the lower waterproof film, so that not only can the humidity conditions of the upper sensing surface and the lower sensing surface be detected, but also the weighted output of the humidity state of the lower sensing surface can be realized. In the present embodiment, the thickness of the upper waterproof film 26 is 3 times the thickness of the lower waterproof film 25, so that when the upper and lower waterproof films are the same (same dielectric constant), the detection sensitivity of the lower sensing surface is 3 times higher than that of the upper sensing surface, that is, the lower sensing surface realizes a 3-times weighted output (with respect to the upper sensing surface).
When the upper and lower sensing surfaces simultaneously have liquid, the generated signals (capacitance values) are added together and output. The upper and lower sensitivity is different, and the proportion of signal stack output is different, the utility model discloses the stack proportion of response face is directly proportional rather than detectivity. In the above case, when the sensor strip is disposed between the surface layer and the absorbent layer of the diaper, the stacking specific gravity of the lower sensor surface (corresponding to the reverse osmosis state of the absorbent layer) is 3 times that of the upper sensor surface (corresponding to the wet state of the surface layer of the diaper), that is, the reverse osmosis state of the absorbent layer is more rapid to present the information for changing the diaper than the wet state of the surface layer.
Regarding the manufacturing problem of the sensor strip 20, the embodiment of the present invention preferably prints the detection electrode 23 on any one surface of the upper and lower waterproof films through the carbon conductive ink, and then compounds the surface printed with the electrode with another waterproof film, so that the upper and lower waterproof films can cover the detection electrode 23. The compounding can be carried out by adopting an adhesive (comprising a structural adhesive, a hot melt adhesive and the like), or hot-pressing compounding by adopting a pre-coating film, or compounding by adopting the processes of hot-coating film, chemical coating film and the like.
In order to realize the electrical connection with the detection electrode in the waterproof film interlayer, the embodiment of the present invention preferably realizes the electrical connection with the detection electrode 23 by providing the contact electrode 27 with a metal tip (needle point) on the capacitance detection device and piercing the waterproof film through the needle point. Generally, the connection is performed at the head and tail positions of the sensor strip, so as to avoid that liquid containing electrolyte infiltrates the contact electrodes at the head and tail positions of the sensor strip to affect the detection operation, in practical application, the effective detection range L of the sensor is narrowed to a certain extent, that is, L is shorter than the length of the sensor strip 20, so that a safe area is provided, and the electric connection is implemented between the safe area and an external capacitance detection device.
Referring to fig. 5 again, a schematic diagram of a cross-sectional structure a-a' of a sensor strip of a double-sided directional weighting and quantization moisture status sensor according to an embodiment of the present invention and an equivalent circuit diagram are shown, which further illustrate the embodiment of fig. 4. The figure includes an upper waterproof film 26, a lower waterproof film 25, and detection electrodes 21 and 22 (collectively referred to as detection electrodes 23) between the upper and lower waterproof films, in addition to a liquid 16 to be detected containing an electrolyte accumulated on the outer surface of the upper waterproof film 26 and a liquid 18 to be detected containing an electrolyte accumulated on the outer surface of the lower waterproof film 25. The embodiment of the present invention will be referred to as a first detection electrode (or a first conductive ink line) 21 and a second detection electrode (or a second conductive ink line) 22. The upper waterproof film 26, the first detecting electrode 21, the second detecting electrode 22, and the liquid 16 containing electrolyte together form a nonpolar electrolytic capacitor C1 (called a first electrolytic capacitor), wherein 21, 22 are electrodes of the electrolytic capacitor C1, 26 is a dielectric of the electrolytic capacitor C1, 16 is an electrolyte of the electrolytic capacitor C1, and the electrolytic capacitance of C1 is inversely proportional to the thickness of 26, proportional to the dielectric constant of 26, and proportional to the coverage/length l of the liquid 16.
Meanwhile, the lower waterproof film 25, the first detection electrode 21, the second detection electrode 22, and the liquid 18 containing the electrolyte together constitute another nonpolar electrolytic capacitor C2 (referred to as a second electrolytic capacitor), wherein 21 and 22 are electrodes of the electrolytic capacitor C2, 25 is a dielectric of the electrolytic capacitor C2, 18 is an electrolyte of the electrolytic capacitor C2, and the electrolytic capacitance of C2 is inversely proportional to the thickness of 25, proportional to the dielectric constant of 25, and proportional to the coverage/length l of the liquid 18.
The capacitors C1 and C2 are connected in parallel, and the capacitance value C detected from both ends of the detection electrodes 21 and 22 is the sum of the two capacitors, i.e., C1+ C2. The value of C2 is greater than C1 for the same liquid coverage/length, because the thickness of the lower waterproofing membrane 25 forming C2 is thinner than the upper waterproofing membrane 26 forming C1 in this embodiment, making the detection sensitivity of the lower sensing surface higher than that of the upper sensing surface, i.e. making the reverse osmosis state of the absorbent layer of the diaper more likely to cause the diaper change information to appear faster than the wet state of the topsheet (when the sensor strip is disposed between the diaper topsheet and the absorbent layer). In the figure, the thickness of the lower waterproof film 25 is only one third of that of the upper waterproof film 26, so that the capacitance of the C2 is 3 times that of the C1 (assuming that the upper and lower waterproof films are made of the same material and have the same liquid coverage).
In practical application, the sensing strip is preferably arranged between the surface layer and the absorption layer of the paper diaper, the upper waterproof film/upper sensing surface faces the surface layer of the paper diaper, and the lower waterproof film/lower sensing surface faces the absorption layer of the paper diaper in use. When a human body urinates, urine can be firstly absorbed by the surface layer of the paper diaper and then enters the absorption layer through the surface layer, and the water in the urine can be locked by the macromolecular absorption material (SAP) in the absorption layer, so that the urine cannot reversely permeate the surface layer of the paper diaper, and the paper diaper can be dried/recovered to be dry.
When the human body urinates, the upper sensing surface firstly detects and outputs a capacitance value C1 representing the wet state of the surface layer of the paper diaper. Then under the action of gravity, the urine flows into the absorption layer further, and is gradually absorbed by the wood pulp and the high molecular materials in the absorption layer and locks the water, and the whole process is about ten seconds to several minutes. Because the sensing strip is formed by the waterproof film and is waterproof, urine can only enter the absorption layer from two sides of the sensing strip, therefore, the lower surface of the sensing strip can still keep dry under the condition of small urine volume, and the capacitance value output by the sensing strip is mainly C1. When the urine volume is increased, especially when the absorption layer of the diaper is saturated and liquid reverse osmosis occurs, a large amount of urine is accumulated on the lower sensing surface of the sensing strip, so that C2 is rapidly increased. Due to the higher sensitivity of the lower sensing surface, the output of the sensing strip is mainly represented as C2 at this time, thereby realizing the weighted output of the reverse osmosis state of the lower sensing surface.
Referring to fig. 6 again, it is a graph of capacitance value versus liquid coverage/length of the sensor strip of the double-sided directional weighting quantization wet state detection sensor according to an embodiment of the present invention. The abscissa L in the figure is the liquid coverage/length of the upper and lower sensing surfaces, and L is the effective detection range/length of the sensor strip 20. The ordinate C in the figure is the capacitance value appearing between the detection electrodes 21 and 22, where C1 is the capacitance value generated by the upper sensing surface due to the liquid 16, C2 is the capacitance value generated by the lower sensing surface due to the liquid 18, the total capacitance value of the upper and lower sensing surfaces is C1+ C2, and when the liquid to be detected covers the entire effective range L of the sensor, C1-C1, C2-C2, and the capacitance C between the detection electrodes 21 and 22-C1 + C2 are maximum values.
It can be seen that the capacitance C2 is greater than C1 for the same liquid coverage/length, i.e. the specific gravity (weighting coefficient) of the lower sensing surface is higher than that of the upper sensing surface for the capacitance C between the electrodes 21, 22, and the reverse osmosis state of the absorption layer corresponding to the lower sensing surface is more early to indicate the change of the diaper than the wet state of the upper sensing surface for the same liquid coverage/length when the sensor strip is disposed between the surface layer and the absorption layer of the diaper.
The utility model discloses electrolytic capacitance value C's capacitance value scope is usually between 0 ~ 10nF, and different detection electrode width, thickness, length and liquid infiltration scope all can influence its capacitance value. The loop resistance of the detection electrode according to the embodiment of the present invention is within 500 kilo-ohms, and therefore the maximum time constant τ of the corresponding detection loop is R, C, 500, 103*10*10-9≈5*10-3Seconds, i.e., 5 milliseconds. That is to say, the detection system formed by the thin film capacitive sensor of the embodiment of the present invention has a relatively fast response speed,can meet the requirement of real-time urine wet state detection.
Referring to fig. 7 again, it is a schematic cross-sectional structure diagram and an equivalent circuit diagram of a sensor strip of a double-sided directional weighting and quantization moisture status detection sensor according to an embodiment of the present invention. The main difference from the embodiment shown in fig. 5 is that the second detection electrode 22 of this embodiment is located at the edge of the sensing layer/interlayer, and its outer edge is located at the seam line 22c of the upper and lower waterproof films and exposed outwards, when the liquid containing electrolyte (liquid to be detected) 16/18 is soaked to the position of 22c, it can contact with the second detection electrode 22, and since the liquid containing electrolyte is conductive, it is equipotential with 22 after contacting with the electrode 22 and becomes a part of the electrode 22 on the circuit, and the liquid equipotential with the detection electrode is called liquid electrode or electrolyte electrode in this embodiment.
In the figure, 14 is a boundary line between the upper and lower sensing surfaces, when the liquid 16 containing the electrolyte infiltrates the upper sensing surface and contacts with 22C, the upper waterproof film 26, the first detection electrode 21, the second detection electrode 22 and the liquid 16 together form a nonpolar electrolytic capacitor C1 (referred to as a first electrolytic capacitor), wherein the detection electrodes 21 and 22 are electrodes of an electrolytic capacitor C1, 16 is the electrolyte of the electrolytic capacitor C1, 26 is the dielectric of the electrolytic capacitor C1, the capacitance of the electrolytic capacitor C1 is inversely proportional to the thickness of 26, is proportional to the dielectric constant of 26, and is proportional to the coverage/length l of the liquid 16 above the first detection electrode 21.
Meanwhile, when the liquid 18 containing the electrolyte wets the lower sensing surface and contacts with the liquid 22C, the liquid becomes a liquid electrode which is equal to the potential of the liquid 22, and at this time, the lower waterproof film 25, the first detection electrode 21, the second detection electrode 22 and the liquid 18 together form a nonpolar electrolytic capacitor C2 (referred to as a second electrolytic capacitor), wherein 21 and 22 are electrodes of the electrolytic capacitor C2, 18 is the electrolyte of the electrolytic capacitor C2, 25 is the dielectric of the electrolytic capacitor C2, the capacitance of C2 is inversely proportional to the thickness of the electrolytic capacitor C2, is proportional to the dielectric constant of the electrolytic capacitor C25 and is proportional to the coverage area/length l of the liquid 18 under the first detection electrode 21.
In this embodiment, the thickness of the lower waterproof film 25 is about one third of that of the upper waterproof film 26, and if the material is the same (i.e., the dielectric constant is the same), the capacitance of C2 is about three times that of C1 when the sensor is completely wetted, thereby achieving a weighted output of the absorbent article absorbent layer reverse osmosis state associated with the lower waterproof film (when the sensor strip is disposed between the topsheet and the absorbent layer of the diaper).
Referring to fig. 8, it is another schematic cross-sectional structure diagram and equivalent circuit diagram of a sensor strip of a double-sided directional weighting moisture status detection sensor according to an embodiment of the present invention. In the figure, 25 is a lower waterproof film, 26 is an upper waterproof film, 21 is a first detection electrode insulated by covering the upper and lower waterproof films, and 22 is a second detection electrode provided on the outer surface of the lower waterproof film 25. Unlike the first and second detection electrodes of the previous embodiment, which are disposed on the same layer and have a symmetrical structure, the first and second detection electrodes 21 and 22 of the present embodiment are disposed on different layers, and both electrodes include a portion overlapping each other (i.e., the orthographic projection of any one electrode on the other electrode includes an overlapping portion, which may be referred to as shadow overlap), at this time, the detection electrodes 21 and 22 and the waterproof film 25 together form a parallel plate capacitor (dielectric capacitor), and the capacitance of the capacitor is proportional to the overlapping area of the electrodes 21 and 22, proportional to the dielectric constant of the medium between the plates, S is the plate area, and d is the plate distance), and inversely proportional to the thickness of the waterproof film 25. In the dry state, the capacitance between the first and second detection electrodes is referred to as initial capacitance C0When C is equal to C0。
In the figure, 14 is a boundary line between the upper and lower sensing surfaces, 16 is a liquid for wetting the upper sensing surface, and 18 is a liquid for wetting the lower sensing surface. When the diaper is wetted, the liquid 16 first soaks the upper sensing surface, the detection electrode 21 corresponds to the liquid 16, the electrode 22 is electrically isolated by the electrode 21, the liquid 16 cannot act on the electrode 22, and the capacitance C between the electrodes 21 and 22 is maintained substantially unchanged from the initial capacitance C0.
With the increase of urine wet, urine will flow downwardThe wanted surface becomes part of the liquid 18 and the situation changes when the liquid 18 wets the lower sensing surface. The electrolyte liquid 18 contacts the electrode 22 and becomes a liquid electrode having an equipotential with the electrode 22, and since the liquid 18 is connected to the liquid 16, which makes the liquid 16 also have an equipotential with the electrode 22, it is equivalent to the electrode 22 being extended to the upper sensing surface by the liquid electrodes 18, 16, and a capacitance is generated between the liquid 16 and the electrode 21 on the upper sensing surface, and since one of the electrodes is the electrolyte liquid, it constitutes an electrolytic capacitor. When the upper and lower sensing surfaces are fully wetted by the liquids 16, 18, the newly generated electrolytic capacitance value is approximately equal to C0At this time, the total capacitance C between the electrodes 21 and 22 is 2xC0The wet state (degree of liquid infiltration) of the sensor can be represented by the formula (C-C)0)/C0When the sensor is dry, the value is 0 (0%, minimum value, where C ═ C0) The value of the sensor at full immersion is 1 (100%, maximum value, where C is 2xC0) The numerical range of the above formula is 0-100%, representing the degree of wetting of the sensor. The present embodiment may express the wetness state of the sensor by a well-defined number, thereby enabling quantitative wetness detection, which benefits primarily from the shadow overlap of the first and second electrodes, which provides a basis/reference for the calculation of quantitative wetness state detection.
Referring to fig. 9 again, this is another schematic cross-sectional structure diagram and equivalent circuit diagram of the sensor strip of the double-sided directional weighting moisture status detection sensor according to the embodiment of the present invention, this embodiment is similar to the previous embodiment of fig. 8, except that the second detection electrode 22 in fig. 9 is disposed on the outer surface of the upper waterproof film 26 instead of the outer surface of the lower waterproof film 25, however, this does not affect the moisture detection function, and the liquid infiltration degree can also be expressed by the formula (C-C)0)/C0To represent.
Referring to fig. 10 again, it is a schematic cross-sectional structure diagram and an equivalent circuit diagram of a sensor strip of a double-sided directional weighting and quantization moisture status detection sensor according to an embodiment of the present invention. Urine 16 containing electrolyte on the upper sensing surface is contacted with a second detection electrode at 1422 are equipotential with the detection electrode 22 and become a liquid electrode, which extends the detection electrode 22 to the area covered by the liquid 16 and forms a non-polar electrolytic capacitor with the first detection electrode 21 and the upper water-proof film 26. Since the width of the electrode 21 is half of that of the electrode 22, when the liquid 16 completely covers the sensing surface, the newly added electrolytic capacitance value is approximately equal to the initial dielectric capacitance value C generated by the electrodes 21 and 22 due to the shadow overlapping0When the total capacitance C is 2x C0. The wet state (degree of liquid immersion) of the upper sensing surface of this embodiment can be represented by the formula (C-C)0)/C0When the degree of wetting is 0 (0%, i.e., C ═ C)0) Representing dry and comfortable; the degree of wetting is 1 (100%, i.e., C ═ 2 xC)0) Representing the upper sensing surface fully covered by liquid.
When the lower sensing surface is soaked by the liquid 18, the width of the detection electrode 22 is the same as that of the lower sensing surface and shields the detection electrode 21, so that the liquid 18 on the lower sensing surface does not act on the electrode 21, and thus, the present embodiment can realize the directional moisture state detection function only for the upper sensing surface, which is a special case of the two-sided directional moisture detection of the embodiment of the present invention, that is, the weight of the moisture state of the upper sensing surface of the present embodiment is 1, and the weight of the moisture state of the lower sensing surface is 0, so that the full-weight output of the moisture state of the upper sensing surface, which is not affected by the liquid of the lower sensing surface, is realized.
Referring to fig. 11 again, it is another schematic cross-sectional structure diagram and equivalent circuit diagram of the sensor strip of the double-sided directional weighting and quantification wet state detection sensor according to the embodiment of the present invention, the electrode position relationship is exactly opposite to the foregoing fig. 10, it can be known through analysis that the detection sensitivity of the upper sensing surface is 0, the detection sensitivity of the lower sensing surface is 1, and the wet state (liquid infiltration degree) of the lower sensing surface can be expressed by the formula (C-C)0)/C0(numerical range 0 ~ 100%) represent, this is the directional moisture detection's of the utility model discloses a two-sided orientation still another special case, when the response strip sets up between the surface course of panty-shape diapers and absorbed layer, can realize the key orientation to the panty-shape diapers absorbed layer reverse osmosis state and detect the function.
Referring to fig. 12 again, it is a schematic cross-sectional structure diagram and an equivalent circuit diagram of a sensor strip of a double-sided directional weighting and quantization moisture status detection sensor according to an embodiment of the present invention. In the figure, the first detection electrode 21 is disposed in the sensing layer without contacting the liquid, and the second detection electrode 22 is disposed on the outer surface of the upper waterproof film 26 and has a width half of that of the first detection electrode 21. In the dry state, an initial dielectric capacitance C exists between the detection electrodes 21 and 220The magnitude of the capacitance is proportional to the width of the second detection electrode 22. When the upper sensing surface is wetted by the liquid 16, the electrolyte liquid 16 contacts the electrode 22 and is equipotential with the electrode 22, thereby becoming a liquid electrode and extending the electrode 22 into the coverage area of the liquid 16. In this case, the upper waterproof film 26, the first detecting electrode 21, the second detecting electrode 22, and the electrolyte liquid 16 together constitute an electrolytic capacitor having a value of about 1xC when the upper sensing surface is fully wetted with the liquid 160Plus an initial dielectric capacitance C0When the total capacitance C is 2x C0. The presence of the liquid on the upper sensing surface increased C by 1 time compared to the dry state, and the detection sensitivity of the upper sensing surface in this example was considered to be 1.
When the liquid penetrates further into the absorption layer and when the absorption layer is saturated and reverse osmosis occurs, the lower sensing surface is also wetted by the liquid, at which point the liquid 18 is conducted to 16 and becomes part of the electrode 22 and another electrolytic capacitance is created between the liquid 18 and the first detection electrode 21. Assuming that the upper and lower waterproof films are of the same thickness and material and the width of the electrode 21 is twice that of the electrode 22, the electrolytic capacitance value generated between the electrode 21 and the liquid 18 under the condition of full immersion is about 2xC0Plus an initial dielectric capacitance C0And electrolytic capacitor 1xC of upper induction surface0The total capacitance C of the sensor of this embodiment under full immersion is 4xC0。
A 2xC is generated due to the lower sensing surface liquid 180The capacitance value of the size at this time is considered to be 2. As is clear from the above analysis, the detection sensitivity of the upper sensing surface of the present example was 1, which is determined byThis gives a total sensitivity (upper sensitivity + lower sensitivity) of 3, if used (C-C)0)/C0When representing the overall wet state of the absorbent article, the value ranges from 0 to 3, with 0 representing a fully dry state and 3 representing a fully wet state. It is noted that in the embodiments of the present invention, C is always greater than or equal to C0Of (1) thus C-C0)/C0No negative number condition occurs. It should be noted that the wet state (degree of infiltration) formula (C-C) of the embodiment of the present invention0)/C0Only the liquid infiltration ratio (degree) of the induction strip is related and the length of the induction strip is not related, although the paper diapers with different specifications may be provided with induction strips with different lengths, the capacitance values generated in the use process are different (the longer the induction strip is, the larger the capacitance value is), but (C-C)0)/C0The proportion of the sensing strip is not changed all the time, a user does not need to set different urine wet alarm triggering threshold values for paper diapers adopting sensing strips with different lengths, namely, the wet state of the embodiment has self-adaptive capacity, and as long as the length of the paper diapers is consistent with the length of the sensing strip, the infiltration degree of the sensing strip is consistent with the wet degree of the paper diapers.
Referring to fig. 13 again, it is another schematic cross-sectional structure diagram and equivalent circuit diagram of the sensor strip of the double-sided directional weighting and quantization moisture status detection sensor according to an embodiment of the present invention, although the structure is different from that of fig. 12, the initial capacitance and the sensitivities of the upper and lower sensing surfaces are the same, which is a variation of the embodiment shown in fig. 12.
Referring to fig. 14 again, it is another schematic cross-sectional structure diagram and equivalent circuit diagram of the sensor strip of the double-sided directional weighting moisture status detection sensor according to the embodiment of the present invention, which is a variation of the embodiment shown in fig. 12, that the second detection electrode 22 is moved from the outer surface of the upper waterproof film 26 to the outer surface of the lower waterproof film 25, and other parameters, including the widths of the first and second detection electrodes and the overlapping width of the two electrodes in the orthographic projection direction, are not changed. In this case, the parameters and performance of the upper and lower sensing surfaces are reversed, the sensitivity of the upper sensing surface is increased, and the detection sensitivity of the lower sensing surface is relatively decreased.
Referring to fig. 15 again, the sensor strip of the double-sided directional weighting and quantification wet state detection sensor according to an embodiment of the present invention includes a schematic cross-sectional structure diagram and an equivalent circuit diagram of a plurality of groups of detection electrodes, which is a variation of the embodiment shown in fig. 5. The present embodiment includes two sets of detection electrodes, a first detection electrode 21A and a second detection electrode 22A in the first set of detection electrodes, and a first detection electrode 21B and a second detection electrode 22B in the second set of detection electrodes. An intermediate water-proof membrane 28 is included between the first and second sets of detection electrodes, and is positioned between and separates the upper and lower water- proof membranes 26, 25.
The first group of detection electrodes of the embodiment are arranged between the upper waterproof film 26 and the middle waterproof film 28, and the detection electrodes 21A and 22A, the liquid 16 to be detected and the upper waterproof film 26 form a first electrolytic capacitor C1 during operation, and the first electrolytic capacitor C1 is mainly used for directionally detecting the moisture state of the upper sensing surface; and the second group of detection electrodes are arranged between the lower waterproof film 25 and the middle waterproof film 28, and the detection electrodes 21B and 22B, the liquid 18 to be detected and the lower waterproof film 25 form a second electrolytic capacitor C2 during working, and the second electrolytic capacitor C2 is mainly used for directionally detecting the moisture state of the lower sensing surface.
The intermediate waterproof membrane 28 of this embodiment is usually made of a relatively thick plastic film, so as to provide a barrier function, and prevent the liquid 16 on the outer surface of the upper waterproof membrane from affecting the electrodes 21B, 22B on the lower waterproof membrane. The intermediate waterproofing membrane likewise prevents the liquid 18 on the outer surface of the lower waterproofing membrane from acting on the electrodes 21A, 22A on the upper waterproofing membrane. That is, in the embodiment of the present invention, due to the existence of the middle waterproof film 28, the first electrolytic capacitance value C1 can reflect the wet state of the upper sensing surface more independently, and the second electrolytic capacitance value C2 can reflect the wet state of the lower sensing surface more independently, thereby realizing the more independent double-sided directional moisture detection function. Whether or not the C1, C2 are weighted, and how the weights are weighted, can be left to the capacitive sensing device 30 electrically connected to the sensor bars 20, which adds flexibility to later signal processing. Of course, it is also possible to perform weighting processing at the ends of the sensor strip, and the weighting output can be realized by connecting the first detection electrodes of each group of detection electrodes and the second detection electrodes of each group of detection electrodes in parallel.
Referring to fig. 16 again, it is a schematic cross-sectional structure diagram and an equivalent circuit diagram of a double-sided directional weighting and quantification moisture state detection sensor according to an embodiment of the present invention, which includes multiple sets of detection electrodes, and is a variation and combination of the embodiments shown in fig. 12 and fig. 14. In the figure, 26 is an upper waterproof film, 25 is a lower waterproof film, 28 is a middle waterproof film, 21A/22A is a first group of detection electrodes positioned on the upper and lower surfaces of the upper waterproof film 26, 21B/22B is a second group of detection electrodes positioned on the upper and lower surfaces of the lower waterproof film 25, wherein the first detection electrode 21A, the second detection electrode 22A, the upper waterproof film 26 and the liquid 16 containing electrolyte on the outer surfaces of the first group of detection electrodes form a first electrolytic capacitor C1 together; at the same time, the first detection electrode 21B, the second detection electrode 22B, the lower water-repellent film 25, and the liquid 18 containing the electrolyte on the outer surface of the 25 of the second group of detection electrodes constitute a second electrolytic capacitor C2. A dielectric capacitance C3 is also created between the sensing electrodes 21A and 21B, but since C3 is fixed, its value is independent of whether the liquid 16, 18 is present.
The electrolytic capacitance values C1 and C2 of the present embodiment correspond to the liquid existing states of the upper and lower sensing surfaces, respectively, and hardly affect each other, that is, the liquid 16 on the upper sensing surface has no effect on C2, and the liquid 18 on the lower sensing surface has no effect on C1, so that the present embodiment realizes a relatively stable and independent double-sided directional quantized moisture state detection function, and the capacitances C1 and C2 are respectively proportional to the coverage areas of the liquids 16 and 18 on the upper and lower sensing surfaces. Whether the C1, C2 is weighted or not can be left to the capacitive sensing device 30 connected to the sensor bars to determine, thereby adding flexibility to the post signal processing. Of course, it is also possible to perform weighting processing at the ends of the sensor strip, and the weighting output can be realized by connecting the first detection electrodes of each group of detection electrodes and the second detection electrodes of each group of detection electrodes in parallel.
Referring to fig. 17 again, it is a schematic cross-sectional structure diagram and equivalent circuit diagram of a double-sided directional weighted moisture status sensor according to an embodiment of the present invention, which is a variation of the embodiment shown in fig. 16, except that the middle waterproof film 28 in fig. 16 is removed and the electrodes 21A and 21B are combined into a common first detecting electrode 21, so that the first detecting electrode 21 can form a first group of detecting electrodes together with the second detecting electrode 22A on the upper waterproof film and a first electrolytic capacitor C1 together with the upper waterproof film 26 and the liquid 16, can form a second group of detecting electrodes together with the second detecting electrode 22B on the lower waterproof film and a second electrolytic capacitor C2 together with the lower waterproof film 25 and the liquid 18, thus, C1 and C2 can represent the quantized moisture levels of the upper and lower sensing surfaces, respectively, and perform similar functions as described above with respect to the embodiment of fig. 16.
Fig. 18 is a schematic cross-sectional structure diagram and an equivalent circuit diagram of a double-sided directional weighting quantification wet state detection sensor according to an embodiment of the present invention, in which the sensor strip includes multiple sets of detection electrodes and there is an electrode multiplexing situation, which is a case of combining/electrode multiplexing the embodiments shown in fig. 10 and 11. In the figure, 22 is a multiplexed second detection electrode, when the sensor strip is fully soaked by the liquid containing the electrolyte (including the liquids 16 and 18 to be detected), the detection electrode 22 can form a first group of detection electrodes with the first detection electrode 21A on the upper waterproof film and a first electrolytic capacitor C1 with the upper waterproof film 26 and the liquid 16, and can form a second group of detection electrodes with the first detection electrode 21B on the lower waterproof film and a second electrolytic capacitor C2 with the lower waterproof film 25 and the liquid 18, so that C1 and C2 can respectively represent the quantized moisture states of the upper and lower sensing surfaces and realize the moisture detection function added to the embodiments shown in the foregoing fig. 10 and fig. 11.
In practical application, there may be more sets of detection electrodes, as long as each set of detection electrodes includes at least one first detection electrode (covered by the waterproof film and not in contact with the liquid to be detected in operation) and at least one second detection electrode (in contact with or not in contact with the liquid to be detected in operation), and an electrolytic capacitor related to the moisture state of a specific sensing surface can be generated between the first and second detection electrodes in each set of detection electrodes, so that the moisture state detection function of multi-direction and multi-sensing surface quantization can be realized.
The utility model discloses the structure of response strip on length direction of above-mentioned embodiment is unanimous, and it is all the same to cut its cross section with response strip on arbitrary length. The utility model discloses the response strip is before integrating with panty-shape diapers, the accessible rolling becomes the film coiled material, per roll of length can reach several hundred meters to kilometers, can be used to produce hundreds of to the unequal panty-shape diapers of thousands, this and the production material and the production technology of current panty-shape diapers adapt to, through current production facility, the response strip can very conveniently set up on the specific aspect of panty-shape diapers, for example, set up between the surface course and the absorbed layer of panty-shape diapers, this and the present technology of setting up panty-shape diapers between the surface course and the absorbed layer with panty-shape diapers water conservancy diversion layer are unanimous. When in panty-shape diapers add the utility model discloses after the response strip, its alright change for having the intelligent panty-shape diapers that quantization urine wet state detected the function, this is very favourable to the intelligent upgrading that realizes traditional panty-shape diapers industry, need not to do any technological transformation to current production facility alright produce brand-new product, also need not change the main material of current panty-shape diapers simultaneously to and can not influence the outward appearance and the performance of current panty-shape diapers, but for a low cost, high performance and standardized intelligent panty-shape diapers urine wet detection solution.
Referring to fig. 19 again, it is a schematic diagram (cross-sectional view) illustrating an embodiment of the present invention that the sensing strip of the double-sided directional weighting quantification wet state detection sensor and the capacitance detection device are electrically connected through the needle tip. In the figure, 30 is a capacitance detecting device electrically connected to the sensor strip 20, the capacitance detecting device 30 includes contact electrodes 31, 32, and the ends of the contact electrodes include metal tips (needle points), and the needle points can pierce through the upper and lower waterproof films 26, 25 to electrically connect to the detecting electrodes 21, 22 covered by the upper and lower waterproof films in the sensor layer. The detecting electrodes 21, 22 on the connecting points 37, 38 will be attached to the upper and lower waterproof films, and after the waterproof films are pierced, the waterproof films will generate a centripetal contraction force to hold the needle tips tightly, and the centripetal contraction force will make the detecting electrodes and the needle tips realize reliable electrical connection.
Referring to fig. 20 again, it is a block diagram of a double-sided directional weighted moisture status detection sensor according to an embodiment of the present invention. In the figure, 10 is a disposable excrement loading and absorbing device (disposable absorbing article, such as a diaper), 20 is a sensing strip arranged on the diaper, and 30 is a detection device which comprises a capacitance detection device 33 which can be connected with a detection electrode on the sensing strip through an electric connection 24, monitors the moisture state of the diaper 10 in real time through a capacitance mode, and then sends out relevant state information (including alarm information) in a wireless mode (48) through a wireless transmission unit 36. The wireless receiving and displaying device 50 receives signals through the receiving unit 51, and then displays/indicates the status through the status display unit 52, or gives an alarm through the status alarm unit 53. In practical applications, a mobile phone or a computer (e.g., a tablet computer) may also be used to take the role of the wireless receiving and displaying device 50, obtain relevant status information through its Wi-Fi or bluetooth and its running App, and perform relevant status display or alarm prompt through its display screen. Through this structure, can make the utility model discloses a two-sided directional weighting quantization moisture state detection sensor of embodiment just has possessed wireless sensor's function, is a progressive expression form.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (10)
1. A double-sided directional weighting quantification moisture state detection sensor is characterized by comprising a film type capacitance sensor, wherein the capacitance sensor comprises a sensing strip, the sensing strip is of a flexible strip-shaped structure and comprises an upper sensing surface and a lower sensing surface, quantification moisture state detection of the upper surface and the lower surface can be realized respectively, and the moisture states of the upper surface and the lower surface can be weighted and output according to a specific proportion, so that comprehensive moisture state information related to a specific layer and a specific direction of a specific detection object is provided.
2. The sensor of claim 1, including an upper waterproof membrane corresponding to said upper sensing surface and a lower waterproof membrane corresponding to said lower sensing surface, a sealed sensing layer being included between said upper and lower waterproof membranes, said sensing layer being insulated from said upper and lower waterproof membranes.
3. The sensor of claim 2, wherein the sensor strip comprises a first detection electrode and a second detection electrode, and the first and second detection electrodes are disposed in the sensing layer, completely covered by the upper and lower waterproof films, and are not in contact with the liquid to be detected during operation; or
The first detection electrode and the second detection electrode are arranged in the induction layer, wherein the first detection electrode is completely covered by the upper waterproof film and the lower waterproof film and is not contacted with the liquid to be detected in work, at least one part of the second detection electrode is exposed outwards through the interlayer edges of the upper waterproof film and the lower waterproof film or a gap or a seam arranged on the waterproof film, and the second detection electrode is contacted with the liquid to be detected containing electrolyte through the electrode of the exposed part in work and enables the liquid to be equipotential with the liquid to be detected and forms a liquid electrode.
4. The sensor of claim 2, wherein said sensor strip comprises a first sensing electrode disposed within said sensing layer and protected from contact with the fluid to be sensed during operation, and a second sensing electrode disposed on the outer surface of either of said upper and lower water-resistant membranes and in operation in direct contact with the fluid to be sensed comprising an electrolyte and rendering said fluid equipotential therewith and forming a fluid electrode; and
the orthographic projection of the first and second detection electrodes comprises an overlapping part, and the electrodes of the overlapping part form a capacitor with an initial capacitance value of C0The dielectric capacitance of (1); and
when the liquid electrode is covered on the outer surface of the waterproof film corresponding to the first detection electrode, an electrolytic capacitor is generated between the liquid electrode and the first detection electrode, and the first detection electrode and the second detection electrode form the medium capacitor C0Adding the electrolytic capacitor to C and outputting, wherein the wet state can be represented by formula (C-C)0)/C0The larger the numerical value, the more serious the comprehensive moisture degree of a specific layer of the specific detection object; and
the induction strip has the length self-adaption capability, and the comprehensive moisture state ((C-C) of a specific layer of the specific detection object0)/C0) Regardless of the length of the sensor strip.
5. The sensor according to claim 3 or 4, wherein when the liquid to be detected containing electrolyte accumulates on the upper and lower sensing surfaces, the first detecting electrode, the second detecting electrode, the upper waterproof film, the lower waterproof film and the liquid to be detected together constitute a non-polar electrolytic capacitor, wherein the first and second detecting electrodes constitute electrodes of the electrolytic capacitor, the liquid to be detected constitutes the electrolyte of the electrolytic capacitor, the waterproof film constitutes a dielectric of the electrolytic capacitor, the capacitance of the electrolytic capacitor is proportional to the area of the liquid to be detected on the sensing surface corresponding to the first detecting electrode, and the detection sensitivity of the upper and lower sensing surfaces is proportional to the dielectric constants of the upper and lower waterproof films and inversely proportional to the thicknesses of the upper and lower waterproof films, the weight of the wet state of the upper and lower sensing surfaces is in direct proportion to the detection sensitivity of the upper and lower sensing surfaces.
6. The sensor of claim 5, comprising an excreta bearing and absorption device having the design of a disposable absorbent article and comprising a facing layer, an absorption layer and a leakage-proof layer, wherein the sensor strip is disposed on the facing layer, or between the facing layer and the absorption layer, or between the absorption layer and the leakage-proof layer.
7. A sensor according to claim 6, comprising a sensing means, said sensing means comprising capacitive sensing means, electrically connected in use to said first and second sensing electrodes of said sensor strip, for performing a combined wetness state sensing function at a particular level and in a particular direction of said excreta carrying and absorption means by capacitive sensing.
8. The sensor of claim 7, wherein the capacitive sensing means comprises a contact electrode comprising a metal needle tip which, in use, can pierce the water-resistant membrane of the sensor strip and be electrically connected to the sensing electrode.
9. The sensor of claim 8, comprising a wireless transmitting unit and a wireless receiving and displaying device, which can transmit and receive the moisture status information of the absorbent article and perform related status display or status alarm prompt.
10. The sensor of claim 9, wherein the sensor strip width comprises 5 to 50 millimeters, the sensor strip thickness comprises 0.01 to 1 millimeter, the waterproofing membrane thickness comprises 5 to 500 micrometers, the detection electrodes comprise conductive ink printed wires or metal foil wires, the upper waterproofing membrane or the lower waterproofing membrane comprises a plastic membrane, the plastic membrane comprises a high tensile strength membrane, the high tensile strength membrane comprises a BOPP membrane or a PET membrane, the lower waterproofing membrane thickness is less than the upper waterproofing membrane, the fecal load bearing and absorbing device comprises a diaper, a training pant, a sanitary napkin, or a diaper, the liquid to be detected containing electrolytes comprises urine, the wireless receiving and display device comprises a cell phone or a computer, the sensor strip comprises more than two sets of detection electrodes, each set of detection electrodes comprises at least one first detection electrode and one second detection electrode, each set of detection electrodes is capable of directionally detecting a wetness state on a particular sensing surface, and the first detection electrode or the second detection electrode of one set is multiplexed with the first detection electrode or the second detection electrode of the other set.
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| WO2021078124A1 (en) * | 2019-10-21 | 2021-04-29 | 黄新凯 | Double-sided directional weighted quantitative humidity state sensor, related product and method |
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| CN111297567A (en) * | 2020-05-15 | 2020-06-19 | 深圳一代科技有限公司 | Absorbent article capable of detecting and distinguishing feces and urine and related method |
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2019
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| WO2021078124A1 (en) * | 2019-10-21 | 2021-04-29 | 黄新凯 | Double-sided directional weighted quantitative humidity state sensor, related product and method |
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